Elias, M.Z.J. (Mario Zefanias Joao); Bezuidenhout, A.J. (Abraham Johannes), 1942-(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)
Kriek, N.P.J.; Keet, D.F.; Raath, J.P.; De Vos, Valerius; Huchzermeyer, Hildegard F.A.K.; Bengis, Roy G.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1996)